第二期_2008_《混凝土與水泥制品》雜志社

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第二期

特超強高性能混凝土的研制與展望

蒲心誠1，王沖1，劉芳1，王勇威2，萬朝均1，楊長輝1

２００8年第2期

摘要

引用本文

摘要：論述了制備特超強高性能混凝土的技術途徑與配比參數。采用常規的原材料及通用的制備工藝，以0.14～0.18的極低水膠比，制成了流動性優異、強度特高的特超強高性能混凝土，混合料坍落度達268mm，擴展度達680mm，90d抗壓強度達175.8MPa，365d達到182.9MPa。與活性粉末混凝土相比，特超強高性能混凝土具有原料易得、制備簡單、施工容易、成本低廉等優勢，將成為未來混凝土科技發展的主導方向。文章還討論了這種混凝土的水化放熱、收縮及脆性等問題。討論表明，這些混凝土所固有的問題，均有獲得滿意解決的有效途徑。文章還展望了這種混凝土的未來應用前景。 Abstract：The preparational technology of ultra high strength high performance concrete (UHSHPC) is developed and the parameters of mix proportion is introduced. Based on the ordinary raw materials, the usual techniques and the extremety low water binder ratio of 0.14 to 0.18, UHSHPC with excellent workability and ultra high strength is successfully produced, the slump of which is up to 268mm, and the spread diameter of slump is more than 680mm, in the meantime, the compressive strength is higher than 175.8 MPa at the age of 90 days and more than 182.9 MPa after 365 days. The UHSHPC has several advantages such as the good availability of raw materials, the simplicity of production, the easiness for construction, the low production costs and etc., compared with the reactive powder concrete. As a result, UHSHPC will becom the main trend of the future concrete technology. The heat evolution during cement hydration, the shrinkage, and the brittleness of this UHSHPC are concerned and discussed. Even though all the above concerns are related with the intrinsic problems of concrete, the effective ways could be found to solve these problems satisfactorily. Finnally, the prospects for application of this UHSHPC are described by authors.

彈性橡膠混凝土壓、彎變形性能試驗研究

王婧一，王立燕，張亞梅

２００8年第2期

摘要

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摘要：對普通混凝土、橡膠混凝土及橡膠纖維混凝土進行了單軸受壓及四點彎曲荷載作用下變形性能的試驗研究，得到了各組混凝土的單軸受壓應力-應變全曲線及彎曲荷載作用下的荷載-撓度曲線，并對單軸受壓應力-應變全曲線進行了擬合，得出了全曲線方程及擬合參數。結果表明，橡膠及橡膠纖維混凝土單軸受壓應變峰值分別是普通混凝土的1.74和1.92倍，彎拉荷載作用下的極限撓度分別達到0.66mm和0.80mm，折壓比分別是普通混凝土的1.45和1.64倍。說明橡膠及纖維的摻入大大提高了普通水泥混凝土的韌性及變性性能。 Abstract: The deformation of the ordinary concrete, rubberized concrete and fiber reinforced rubberized concrete under uniaxial compression and four-point flexure is studied by tests, and the stress-strain curves under uniaxial compression and the load-deflection curve under four-point flexure are obtained. Then the complete stress-strain curves are analyzed and compared theoretically, and the simulated stress-strain equations are established. The results show that the strain at ultimate stress of rubberized concrete and fiber reinforced rubberized concrete under uniaxial compression is 1.74 and 1.92 times of the ordinary concrete respectively, and the ultimate deflection of rubberized concrete and fiber reinforced rubberized concrete under flexure is of 0.66mm and 0.80mm respectively, while the ordinary is only of 0.32mm. The ratio of flexural strength to compression strength of rubberized concrete and fiber reinforced rubberized concrete is 1.45 and 1.64 times of the ordinary concrete. The results also show that the addition of rubber and fiber has greatly improved the toughness and deformationness of the ordinary cement concrete.

不同工藝生產的橡膠微粒對路面混凝土性能的影響

李清海1，史新亮2，管學茂2

２００8年第2期

摘要

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摘要：目前橡膠微粒生產工藝多種多樣，且不同工藝生產的橡膠微粒對混凝土性能的影響不一。本文從路面混凝土的工作性能和強度方面，研究兩種工藝生產的橡膠微粒在不同摻量時對路面混凝土性能的影響。 Abstract: At the present time, there are many different production technics of rubber particles. The rubber particles of different production technics have different effects on concrete properties. In this paper, the paving concrete properties influenced by rubber particles of two kinds of production technics were studied, including paving concrete workability and strength.

化學激發膠凝材料的性能研究

鄭敏升

２００8年第2期

摘要

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摘要：通過摻入8%非堿礦物激發劑KL和1.5%堿性激發劑KJ，可以激發礦渣及粉煤灰潛在的水硬活性，從而可配制出性能良好的化學激發膠凝材料。試驗結果表明，所配制的化學激發膠凝材料具有良好的基本性能，其3d、28d抗壓及抗折強度完全達到P·O42.5水泥的性能要求，凝結時間及安定性合格，具有高的后期強度、抗滲性能、抗腐蝕性能、抗碳化性能和抗鋼筋銹蝕性能，以及具有低的干縮率和堿骨料反應膨脹率等。 Abstract: A chemical activated material, which is based on activated slag and fly-ash and has many good properties, has been developed by adding of 8% non-alkali mineral activator and 1.5% alkali activator. The testing results showed that, its compressive and flexural strength at 3d or 28d ages meets the requirements of P.O42.5 cement, and its setting time and soundness are qualified to the standards. Moreover, it has many other excellent properties, such as high strength at later age, low dry shrinkage, high impermeability, high chemical-attack resistance, high corrosion resistance, high carbonation resistance, and low alkali-aggregate- reaction expansion, etc.

氯離子在水泥砂漿毛細孔中遷移規律的試驗研究

吳克剛1，謝友均1，馬昆林1，李世秋2

2008年第2期

摘要

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摘要：采用在3.5%氯化鈉溶液（質量分數）中半浸泡的試驗方法，研究了氯離子通過毛細作用進入水泥砂漿后，氯離子與堿含量沿試件豎向的變化規律。結果表明，氯離子在砂漿豎向斷面上類似地呈開口向上的拋物線型分布。氯離子與堿含量隨試件高度的增加而減小，且表層砂漿中的氯離子含量明顯高于內部，水泥混凝土材料內外相對濕度的差異是造成鹽溶液的侵入呈類似拋物線型分布的主要原因。 Abstract: In order to investigating the distribution rule of chloride and alkali, when its ions penetrated into concrete by capillary action, the tests were carried out by the method of partially soaking the speciments in sodium chloride solution with mass fraction of 3.5%. The rezults show that, the shapes of chloride ion's occupation on the surface of vertical section of speciments like a parabora curve with both ends go up, the contents of chloride and alkali decrease with increasing of height of speciment, and the contents of chloride ions at the outward layers of speciment are obviously higher than that of inner. The main cause, that makes the distribution as stated above, is the differential of relative humidity between the outernal and internal of a concrete speciment.

混凝土早期自收縮性能的實驗研究

費治華，喬艷靜，田倩，劉加平

２００8年第2期

摘要

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摘要：采用自行設計制作的混凝土早期自收縮測試裝置，研究了混凝土配合比參數（膠凝材料用量、水膠比、砂率）、摻合料、減水劑種類等對早期自收縮的影響。實驗結果表明，粉煤灰與減縮劑能有效降低混凝土的早期自收縮；隨水膠比的增大，混凝土自干燥收縮逐漸降低；混凝土的自干燥收縮是隨著膠材用量的增大而增大的；此外，在水膠比和其它配合比參數不變的條件下，存在著一個最佳的砂率。 Abstract: With using of an apparatus designed and developed by authors, the influences of proportioning parameters ( binder content, water-binder ratio, percentage of and), mineral admixture and kinds of water reducer on the early self-shrinkage of HPC were experimentally studies. The rezults show that, the fly ash and contraction-reducer can effectively reduce the early self-shrinkage of concrete, and the early self-shrinkage is decreased with the increasing of water binder ratio, but increased with the increasing of binder content. Besides, there is the most excellent percentage of sand when the proportioning parameters of concrete, water binder ratio and others are under unchanging.

綠色耐腐蝕混凝土排水管生產新工藝研究

劉紅飛1，管娟2，張吟秋3

２００8年第2期

摘要

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摘要：近年來，綠色耐腐蝕混凝土排水管和排水管芯模振動成型工藝這二項新技術在國內的使用量有了較大的增加，文章介紹了在國內首次開展芯模振動成型工藝用于生產綠色耐腐蝕混凝土排水管的研究情況，并就芯模振動成型工藝生產耐腐蝕混凝土排水管的經濟性進行了分析。

淺談大口徑PCCPE管道的安裝

劉川

２００8年第2期

摘要

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摘要：敘述了大口徑PCCPE的吊運和裝卸、溝槽開挖、接口對接的方法，提出了常見問題的處理、接口水壓試驗、接縫灌漿、管道回填的主要方式和應注意的問題。

大口徑PCCP外保護層防腐操作方案設計

劉同軍

２００8年第2期

摘要

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摘要：針對大口徑PCCP外保護層防腐處理困難的問題，提出了切實可行的高壓無氣噴涂工藝施工方式。在具體施工方法上，設計了專用的外防腐操作機，使超大口徑PCCP產品的外壁防腐處理滿足高效、便利的要求。

管樁工藝設計中的能源設計和設備選型

鄒文剛

２００8年第2期

摘要

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摘要：總結實踐經驗，提出了管樁工藝設計中應注意的能源設計問題。重點敘述了鍋爐、蒸壓釜、蒸養池等設備的選型和相關設計，提出了熱電聯產在管樁行業應用的可行性和必要性。通過節能降耗的途徑來降低管樁生產成本，有利于促進行業健康持續地發展。

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